Boring-tool.



G. C. BECK.

BORING TOOL. APPLICATION FILED MAR. 14. 1916. RENEWED JULY 22.19l8.

Patented Sept. 10, 1918.

3 S.HEETS-SHEET I.

16 grave/141:0;

dtfoznm Geo 9e C. BCc h G. C. BECK.

BORING TOOL.

APPLICATION FILED MAR. 14. 1916. RENEWED JULY 22.1918.

3 SHEETSSHEET 2- Patented Sept. 10, 1918.

A U nEmEEE dttomeq G. C. BECK.

BORING TOOL.

APPLICATION FILED MAR. 14. I916. RENEWED JULY 22.1918.

PatentedSept. 10, 1918.

3 SHEETSSHEET 3.

NlE

GEORGE C. BECK, OF SPOKANE, WASHINGTON.

BORING-TOOL.

Application filed March To all whom it may concern:

Be it known that I, GEoRGn G. BECK, a citizen of the United States, residing at Spokane, in the county of Spokane and State of Washington, have invented certain new and useful Improvements in Boring- Tools, of which the following is a specification.

This invention relates to new and useful improvements in boring tools. and more particularly to a tool of this character for use in boring and reboring cylinders of engines, pumps or other piston cylinders, and the. primary object is to provide a tool that will make a smooth finish, boring accurately, and one that may be adjusted to less than one one-thousandth of an inch.

Still another object of the invention resides in providing an improved means for setting the operating parts of the tool for fine adjustments, and a still further object is to provide an improved gage for use in adjusting the cutters and for sizing the bore of the cylinder.

A further object resides in providing following blocks on the head of the tool which are adjustable radially to fit any size'of bore, and which carry the finishing devices for the bore of the cylinder.

A still further object resides in providing a device of simple and durable construction, comparatively simple and inexpensive to manufacture, and one which will be very efficient and useful in operation.

With these and numerous other objects in view, my invention consists in the novel features of construction, combination and arrangement of parts as will be hereinafter referred to, and more particularly pointed out in the specification and claims.

In the accompanying drawings, forming a part of this application,

Figure 1 is a section through a cylinder, showing a device constructed in accordance with my invention and applied to use.

Fig. 2 is a side elevation, partly in section of the complete tool removed.

Fig. 3 is a plan view of the gage which is adapted to be attached to the cylinder, as shown in Fig. 1,

Fi 4: is a bottom plan view of the tool, showing the cutters,

Fig. 5 is a similar view with the cutters in slightly altered position, and further disclosing one of the cutter gages applied to use,

Specification of Letters Patent.

Patented Sept. 10, 1918.

14, 1916, Serial No. 84,109. Renewed July 22, 1918. Serial No. 246,230.

Fig. 6 is a perspective view of one of the follower blocks or guides,

Fig. 7 is a perspective view of one of the gage members used for adjusting the knives and the followers,

Fig. 8 is a section through a follower, as shown in Fig. 6,

Fig. 9 is a fragmentary view of the lower portion of the tool, showing the gage for the cutters or knives in position thereon,

Fig. 10 is a perspective view of the coneshaped adjusting member arranged on the stem,

Fig. 11 is a fragmentary side elevation showing the use of another form of gage for the cutters,

Fig. 12 is a front elevation of this gage last mentioned, and

Fig. 13 is a perspective view of a gage member for use internally in connection with the cylinder for reboring purposes.

In describing the invention, 1 shall refer to the drawings, using similar reference characters to designate corresponding parts throughout the several views.

I prefer to use my improved tool in connection with a drill press, and in this connection I have shown a chuckl, to which is engaged the stem 2, the latter being of any desired length, and tapered smaller toward its upper end, as clearly shown in Figs. 1 and 2 of the drawings. Fixedly mounted on the lower end of this stem is a disk-like cutting head 3, the lower face of which is provided with grooves 4, disposed radially or otherwise, in which are mounted the cutters or knives 5. Cutter retaining blocks or plates 6, are also provided in the under face of said cutter head, the same being retained in place by means of set screws-7, and through this medium these cutters or knives 5 are secured in any adjusted position in the cutter head.

superposed on the head 3, is an additional disk-like head member 8, which, for convenience, may be termed a gage head, and ball-bearing races therefor which together may be designated as 9, are provided between the heads 3 and 8, as clearly shown in Fig. 2, whereby said member 8 may rotate on the member 3, or vice versa. The innerperiphery of the disk-like member 8 is threaded and engaged with the lower end of an externally-threaded tubular member 10, the latter being telescoped over the stem 2. The stem 2 is threaded adjacent its upper end of tubular member 10 receiving said ball-bearings thereagainst, and it will be seenthat by providing a ball-bearing connection at the upper and lower ends of said member 10, the stem 2 with the cutter head 3 at the lower end thereof may rotate freely with respect to the member 10 and parts carried thereby. -A locking nut 12 above the member 12 serves to lock-the-latter in position.

Guide members or following blocks 15 are mounted in radial grooves 16 in the up per face of the gage head 8, the same being adapted to be locked in place by means of the retaining strips 17 which are secured to the upper face of the member 8 between the blocks 15 by means of the set screws 18. These following or guide blocks have the fiber strips 19 secured to the outer faces thereof, these strips being adapted for contact with the bore of the cylinder as the device is operated. The inner faces of the blocks 15 have the upper portions thereof beveled as shown at 20, and a cone-shaped adjusting nut 21 is carried on the tubular member 10 and designed for engagement with the beveled faces 20, whereby to force said blocks or followers 15 outwardly, according to desired adjustment. A dial or scale 22 is provided on the upper portion of the nut 21, which is designed for coiiperation with the properly graduated longitudinal scale 23, provided on the member 10, as shown in Fig. 10 of the drawings, whereby such adjustments may be made to scale. In View of this construction and scale arrangement very fine and accurate radial adjustments of blocks 15 may be made by rotation of the nut 21, and it may be here stated that the upper portion of the nut 21 which contains the scale 22, is slightly reduced and has its outer periphery knurled to form a finger means, as shown at 24.

I have provided for the adjustment of the knives or cutters 5 to accommodate the various sizes of bores, and I have further provided a gage for these knives or cutters. This gage member consists of a metallic strip 25 which is removably secured by means of set screws 26 to the outer face of one of the guide or follower blocks 15. The lower portion of this strip 25, which extends a short distance belowthe lower end of the guide or follower block, is doubled upon tions.

itself as shown at 27, and a set screw 28 with a head 29 is engaged with a threaded opening in this portion 27. A dial or scale is provided on the outer face of the head 29, as shown in Fig. 12 of the drawings, and the upper portion of the doubled end of the strip 25 is bent outwardly as shown at 30,

to provide a protection for the head 29.

The extreme outer end of the portion 30 is scored as at 31, which is designed'for cooperation with the dial or scale on the head 29. The set screw may, therefore, be adjusted to predetermined degrees, and the cutter blades 5 moved outwardly to contact therewith, as shown in Fig. 11. After one cutter or knife is properly adjusted and gaged, the stem 2 may be rotated so that the remainder of the cutter blades may be adjusted to the same degree on this gage.

As a rule, when an engine cylinder is to be rebored, new-pistons are first made to the desired diameter, and the bore is then made to correspond to the piston. In such a case, a ring gage 32 is provided which is adapted to be adjustably secured to the up per end of the cylinder, as shown in Fig. 1 of the drawings. The piston is then placed in the gage and members 33, which are adjustable radially on the ring 32, are adjusted to fit closely to said piston. These members 33 consist of angular plates, the inner angular portions of which are concave as shown at 34 to fit snugly to the piston, and said plates are guided on set screws 35, which extend through slots 36 in said plates. These plates 33 may be adjusted to any degree radially by means of additional set screws 37, which operate in guides or the like 38 carried on extensions 39 formed on the ring member, and the heads of these set screws 37 are provided with dials or the like to cooperate with scales 40- struction and scale arrangement the plates 33 may be adjusted very accurately to less then one one-thousandths of an inch, and when so adjusted, the set screws 35, which have wing portions thereon, may be turned to secure said plates in their adjusted posi- Through this medium it may also be seen that the ring member 32 is perfectly centered with respect to the cylinder. After these adjustments are made, the boring tool proper is inserted within said gage, the. guides 15 of the tool being adjusted so as to contact with themembers 33 by means of the rotation of the nut 21 hereinbefore referred to, after which the cutters may be properly adjusted by attaching the graduated ad usting means 25 to one of the guides in Fig. 3 may then be applied thereto, in

the same manner as in the case of the. boring tool adjustment just explained, and thus obtain accurate measurement as a guidance for proper corresponding adjustment of the boring tool guide blocks 15. After it has been determined that the new bore will be made a certain diameter larger than the gage adjustment, previously made, but before said adjustment of the boring tool guide blocks, the gage plates 33 may be readjusted to the increased size of the cylinder desired by utilizing the scale graduations 40 in cooperation with the nuts 37.

It is sometimes necessary to adjust the knives or cutters before any other operation is made, and in such instances it is usually found that a request has been made to have a cylinder bored to a certain diameter. Under such conditions, it is not necessary that the above referred to operations be made. In such instances, I prefer to use a difierent form of gage such as is shown in Figs. 7, 9 and 5 of the drawings. This gage consists of a strip of angular metal 46, one face of which is bifurcated to form the arms 47. That portion of the strip which is removed to form the arms 47 is bent or doubled upon itself and upon the opposite face of the member 46 to form a piece 48. The arms 47 are provided with a plurality of alining openings 49 which are set at predetermined distances so as to register with openingsin the under face of the cutter head 3, whereby to be secured by means of set screws 50. These openings are so positioned that the device may be adjusted radially on the bottom of the cutting head to give a particular diameter of bore, as by rotation of the adjusting screws the cutters and guide blocks may be adjusted to secure the proper diameter of bore. An adjusting screw 51 projects through the piece 48 and the adjacent face of the member 46 which accommodates the adjustment of the knives or cutters, as clearly shown in Figs. 5 and 9 of the drawings, the graduations or scale on the face of the head of screw 51 providing the means in conjunction with the indicator score 51 of the projection 51" of member 48 for very accurate adjustment to scale. An additional adjusting screw 52 with like graduations is provided in the upper portion of the member 46 for similar adjustment of the guides or following blocks.

It is to be understood that the diametrical adjustment of the cutters and the guides or following blocks must be approximately the same so'that the fiber faces of the guides will firmly, though not fixedly, engage the wall of the cylinder bore and thus prevent wabbling or lateral vibration of the cutter head during the boring operation.

All correlated scale graduations andthe scale. graduations adapted to be adjusted with relation to indicator marks or scores are, of course, acccurately determined by proper mathematical calculations in order to fulfil their purposes. But the manner of calculating does not enter into this invention and explanation thereof is believed unnecessary.

Often after the bore has been made, it is found necessary to grind or finish the interior. In this event, an attachment is provided for consisting of a metallic channelshaped member 53rwhich is adapted to be secured to the guide blocks 15 along the outer face thereof. This metallic member 53 retains in place a piece of fine emery cloth 54, as clearly shown in Fig. 8 of the drawings. Such an attachment may be provided on each of the guide blocks and the gage head 8 locked to the stem 2 by any suitable means such as a screw inserted through member 10 and adapted to screw into a recess in the stem 11. When the stem is thus turned, the interior of the cylinder will obviously be finished smoothly.

From the foregoing description of the construction of my improved device, the operation of the same will be readily under stood, and it will be seen that I have provided a simple, inexpensive and .efiic1ent means for carrying out the objects of the invention.

While I have particularly described the elements best adapted to perform the functions set forth, it is obvious that various changes in form, proportion and in the minor details of construction may be resorted to within the scope of the appended claims, without departing from the spirit or sacrificing any of the principles of the invention.

Having thus described my invention, what I claim is:

1. A boring tool of the class described, including a stem, a cutter head carried at the lower end thereof, a gage head loosely mounted on the stem and superposed on the cutter head, guide members carried by said gage head and means for adjusting said guide members radially.

2. A boring tool of the class described, including a stem, a cutter head carried on the lower end thereof, a tubular member loosely mounted on said stem, a gage head carried on the end of said tubular member and superposed on the cutter head, a plurality of guide members movable radially on said gage head, and an adjusting nut carried on the tubular member to adjust said guide memberson the gage head.

3. A boring tool of the class described, including a stem, a cutter head carried on the lower end thereof, an externally threaded tubular member loosely carried on said stem, a gage head carried on the lower end of said tubular member and superposed upon said cutter head, a plurality of guide members adjustable radially on said gage head, the

inner faces of said guide members being beveled, an adjusting nut of cone-shaped design engaged with said tubular member and adapted to contact with the beveled faces of the guide members to adjust the latter, and means to lock the tubular mem ber against longitudinal movement on the stem.

4. A boring tool of the class described, including a stem, a cutter head carried on the lower end thereof, a tubular member provided with a graduated scale loosely mounted on said stem, a gage head carried on said. tubular member and superposed upon the cutter head, a plurality of guide members adjustable radially on the gage head, an adjusting member for said guide members movable longitudinally on said tubular member, and provided with a graudated end thereof, radially movable cutters car-- ried thereby; a gage head loosely mounted on the stem and superposed on said cutter head, and radially adjustable guide members carried bysaid gage head'; of a cutter gage including a member removably secured to one guide member, and a radial adjusting screw carried thereby adapted to cooperate with the cutters.

6. A boring tool of the class described including a stem, a cutter head carried at the lower end thereof, a gage head superposed on said'cutter head and loosely carried on the stem, a plurality of guide members radially adjustable on said gage head, means for adjusting said guide members, and graduated scale means for gaging the adjustment of said guide members and the cutters carried on the cutter head.

In testimony whereof I aflix my signature.

GEORGE C. BECK. 

